A.T. Robertson Commentary Acts 22:18

"and saw him saying unto me, Make haste, and get thee quickly out of Jerusalem; because they will not receive of thee testimony concerning me." — Acts 22:18 (ASV)

Saw him saying (ιδειν αυτον λεγοντα). The first visit after his conversion when they tried to kill him in Jerusalem (9:29).

Because (διοτι, δια and οτ),

for that .